Portable toilet



FIG. 1 is a perspective view of a portable toilet showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a side view thereof;

FIG. 5 is a top plan view thereof; and,

FIG. 6 is a bottom plan view thereof.

The broken line showing of bottom details in FIG. 6 is included for the purpose of illustrating portions of the portable toilet and forms no part of the claimed design. 

The ornamental design for a portable toilet, as shown and described. 